U.S. patent application number 15/107680 was filed with the patent office on 2016-11-03 for printer.
This patent application is currently assigned to SATO HOLDINGS KABUSHIKI KAISHA. The applicant listed for this patent is SATO HOLDINGS KABUSHIKI KAISHA. Invention is credited to Takayoshi JINNOUCHI, Hitoshi ONODERA.
Application Number | 20160318318 15/107680 |
Document ID | / |
Family ID | 53478900 |
Filed Date | 2016-11-03 |
United States Patent
Application |
20160318318 |
Kind Code |
A1 |
ONODERA; Hitoshi ; et
al. |
November 3, 2016 |
PRINTER
Abstract
In a printer that performs printing on a label of a continuous
paper while feeding the continuous paper unwound from a paper sheet
supply unit to a side of a printing head portion via a damper
portion, a head pressure plate is arranged between an operating
portion that adjusts a pressing force against a thermal head
portion and a printing line of the thermal head portion such that
the head pressure plate is formed extended to connect them.
Inventors: |
ONODERA; Hitoshi; (Saitama,
JP) ; JINNOUCHI; Takayoshi; (Saitama, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
SATO HOLDINGS KABUSHIKI KAISHA |
Tokyo |
|
JP |
|
|
Assignee: |
SATO HOLDINGS KABUSHIKI
KAISHA
Tokyo
JP
|
Family ID: |
53478900 |
Appl. No.: |
15/107680 |
Filed: |
December 25, 2014 |
PCT Filed: |
December 25, 2014 |
PCT NO: |
PCT/JP2014/084333 |
371 Date: |
June 23, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B41J 11/0005 20130101;
B41J 3/4075 20130101; B41J 25/312 20130101; B41J 15/042
20130101 |
International
Class: |
B41J 15/04 20060101
B41J015/04; B41J 3/407 20060101 B41J003/407; B41J 25/312 20060101
B41J025/312 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 26, 2013 |
JP |
2013-268264 |
Claims
1.-4. (canceled)
5. A printer comprising: a feeding unit configured to feed a print
medium along a medium feed path; a printing unit disposed to oppose
the feeding unit in the medium feed path, the printing unit being
configured to print on the print medium fed along the medium feed
path; and a pressing unit configured to press the printing unit
onto the feeding unit in a state where the print medium is nipped
between the printing unit and the feeding unit, wherein the
pressing unit includes: a pressing-force adjustment portion
disposed at an upstream side in a feed direction of the print
medium with respect to a printing portion of the printing unit, the
pressing-force adjustment portion adjusting a pressing force on the
printing unit; and a pressing member disposed between the
pressing-force adjustment portion and the printing unit in a state
where the pressing member connects a pressing portion of the
pressing-force adjustment portion and the printing portion of the
printing unit, the pressing member being configured to transmit the
pressing force from the pressing-force adjustment portion to the
printing portion through a tip end of the pressing member.
6. The printer according to claim 5, wherein the pressing member
has a bent portion formed by bending downward, and the tip end is a
tip of the bent portion.
7. The printer according to claim 5, wherein the pressing-force
adjustment portion includes: an operating portion disposed to
operate the pressing force on the printing unit; a pressure
changing unit disposed to be stepwise in order to change the
pressing force on the printing unit; and an elastic member disposed
in order to change the pressing force on the pressing member.
8. The printer according to claim 5, wherein the pressing-force
adjustment portion includes: an operating portion disposed movably
to operate the pressing force on the printing unit; a pressure
changing unit disposed to be stepwise in order to change the
pressing force on the printing unit in stages corresponding to a
position where the operating portion moves; and an elastic member
disposed in order to change the pressing force on the pressing
member corresponding to the position where the operating portion
moves.
9. The printer according to claim 5, wherein the pressing member is
disposed swingably.
10. The printer according to claim 5, wherein a plurality of the
pressing members are disposed along a width direction of the print
medium.
Description
TECHNICAL FIELD
[0001] The present invention relates a printer, for example, a
printer having a label printing function that prints desired
information, such as a character, a sign, a diagram, a barcode, or
similar information, on a label or a similar printing medium.
BACKGROUND ART
[0002] A label printer is a printer having a function that, for
example, while unwinding a rolled continuous paper to feed the
continuous paper in a sheet-shape, prints desired information on a
label of the continuous paper.
[0003] At a printing unit of this label printer, a thermal head
portion, which performs printing on the label, and a platen roller
portion, which feeds the continuous paper, are disposed in a
mutually opposing state.
[0004] For printing, a printing quality is improved by contacting a
printing portion of the thermal head portion closely to the label
of the continuous paper by the thermal head portion being pressed
onto a side of the platen roller portion in a state where the
continuous paper is nipped between the thermal head portion and the
platen roller portion.
[0005] It should be noted that, for example, JP2007-301869A
discloses a printer that has such label printing function.
SUMMARY OF INVENTION
[0006] For the printer having the label printing function such as
the above, how to effectively press the printing portion of
printing means is a significant subject. For example, an
appropriate printing pressure with which the thermal head portion
is pressed onto the platen roller portion differs depending on a
thickness and a rigidity of the continuous paper to be printed,
thus a printer that can change its printing pressure in such cases
is desired.
[0007] The present invention has been made in view of the
above-described technical background, and it is an object of the
present invention to provide a printer that can effectively press
the printing portion of the printing means.
[0008] To solve the above-described subject, a printer according to
a first aspect of the present invention includes a medium supply
unit configured to supply a print medium, feeding means configured
to feed the print medium supplied from the medium supply unit along
a medium feed path, printing means disposed to oppose the feeding
means in the medium feed path, the printing means being configured
to print on the print medium fed along the medium feed path, and
pressing means configured to press the printing means onto the
feeding means in a state where the print medium is nipped between
the printing means and the feeding means, wherein the pressing
means includes a pressing-force adjustment portion configured to
adjust a pressing force on the printing means; and a pressing
member disposed between the pressing-force adjustment portion and
the printing means in a state where the pressing member is extended
to connect a pressing portion of the pressing-force adjustment
portion and a printing portion of the printing means, the pressing
member being configured to transmit the pressing force from the
pressing-force adjustment portion to the printing portion.
[0009] In a printer according to a second aspect of the present
invention of the above-described first aspect, the pressing-force
adjustment portion includes an operating portion disposed movably
within an operating surface to operate the pressing force on the
printing means, a pressure changing unit disposed in a state of
being engaged with the operating portion, the pressure changing
unit being disposed to be stepwise in order to change the pressing
force on the printing means in stages corresponding to a position
where the operating portion moves; and an elastic member disposed
in the operating portion in order to change the pressing force on
the pressing member corresponding to the position where the
operating portion moves.
[0010] In a printer according to a third aspect of the present
invention of the above-described first or second aspect, the
pressing member is disposed swingably.
[0011] In a printer according to a fourth aspect of the present
invention of any one of the above-described first to third aspects,
a plurality of the pressing members are disposed along a width
direction of the print medium.
EFFECT OF INVENTION
[0012] According to the first aspect, the printing portion of the
printing means of the printer can be pressed effectively.
[0013] According to the second aspect, the printing portion of the
printing means of the printer can be pressed effectively with a
simple structure.
[0014] According to the third aspect, a height of the pressing
member can be adjusted corresponding to the print medium of various
thicknesses, thus printing can be performed properly on the print
medium of the various thicknesses.
[0015] According to the fourth aspect, the print medium of various
widths can be pressed properly, thus printing can be performed
properly on the print medium of the various widths.
BRIEF DESCRIPTION OF DRAWINGS
[0016] FIG. 1 is an overall perspective view of an appearance of a
printer according to one embodiment of the present invention.
[0017] FIG. 2 is a perspective view for illustrating an inside of
the printer in FIG. 1.
[0018] FIG. 3 is a side view of the printer in FIG. 2.
[0019] FIG. 4A is an enlarged perspective view where a printing
unit in a closed state of a printing head portion in FIG. 3 is
viewed from a front.
[0020] FIG. 4B is an enlarged perspective view where the printing
unit in an open state of the printing head portion in FIG. 3 is
viewed from the front.
[0021] FIG. 5 is an enlarged perspective view where the printing
unit in FIG. 4A is viewed from a back side.
[0022] FIG. 6 is an enlarged side view of the printing portion in
FIG. 3.
[0023] FIG. 7 is a perspective view where a printing head portion
in FIG. 6 is extracted and viewed from a lower side.
[0024] FIG. 8 is an exploded perspective view of a head
mechanism.
[0025] FIG. 9 is a perspective view illustrating an assembled state
of a head slider portion and a head holding portion which
constitute the head mechanism in FIG. 8.
[0026] FIG. 10 is a perspective view illustrating an assembled
state of the head mechanism in FIG. 8.
[0027] FIG. 11 is a perspective view of the printing unit of the
printer in FIG. 1 viewed from the front side.
[0028] FIG. 12A is a plan view of a top surface of an operating
surface plate which constitutes an operational panel unit of a
pressing device.
[0029] FIG. 12B is a plan view of a back surface of the operating
surface plate in FIG. 12A.
[0030] FIG. 13A is a perspective view of the operating surface
plate in FIG. 12A viewed from a back side.
[0031] FIG. 13B is a main part enlarged perspective view of the
back surface of the operating surface plate in FIG. 13A.
[0032] FIG. 14 is a cross-sectional view of a XIV-XIV line of the
printing head portion in FIG. 11.
[0033] FIG. 15 is a cross-sectional view of a XV-XV line of the
printing head portion in FIG. 11.
[0034] FIG. 16 is a cross-sectional view of a XVI-XVI line of the
printing head portion in FIG. 11.
[0035] FIG. 17A is a schematic cross-sectional view of the printing
unit before a thermal head portion is pressed.
[0036] FIG. 17B is a schematic cross-sectional view of the printing
unit while the thermal head portion is being pressed.
DESCRIPTION OF EMBODIMENTS
[0037] The following describes an embodiment as an example of the
present invention in detail based on drawings. It should be noted
that in the drawings to describe the embodiment, an identical
reference numeral is basically attached to an identical component,
and its repeated description is omitted.
[0038] A feed direction for printing a continuous paper (print
medium), specifically a direction feeding the continuous paper from
a paper sheet supply unit to a thermal head portion, is referred to
as a printing direction, and if there is no specific description,
an upstream in the feed direction is referred to as an upstream
side in the printing direction, and a downstream in the feed
direction is referred to as a downstream side in the printing
direction.
[0039] FIG. 1 is an overall perspective view of an appearance of a
printer according to the embodiment.
[0040] A printer 1 according to the embodiment has, for example, a
label printing function, which prints information such as a
character, a sign, a diagram, a barcode, or similar information, on
a label adhered temporarily on a liner sheet.
[0041] On a front cover portion 2 at a front of the printer 1, an
operational panel unit 3, a power switch 4, and an issue port
(medium discharge port) 5 are disposed.
[0042] On the operational panel unit 3, an LCD (Liquid Crystal
Display), which displays a message or similar information, a
plurality of keys (line key, feed key, function key, direction
indicating key, cancel key, and similar keys), which operate an
operation of the printer 1, and a plurality of LEDs (Light Emitting
Diodes), which indicate a state of the printer 1, are disposed.
[0043] On one side surface of the printer 1, an open cover portion
6 is openably/closably mounted in a vertical direction by hinge
portions 7 at two sites.
[0044] Next, an internal structure of the printer 1 will be
described in reference to FIG. 2 and FIG. 3. FIG. 2 is a
perspective view for illustrating an inside of the printer in FIG.
1. FIG. 3 is a side view of the printer in FIG. 2. It should be
noted that in the following description, a front side of the
printer 1 (front cover portion 2 side) is referred to as a front
(downstream side in the feed direction of the continuous paper),
and its opposite side, and a back side (back cover portion side) is
referred to as a rear (at an upstream side in the feed direction of
the continuous paper).
[0045] Inside the printer 1, a paper sheet supply unit (medium
supply unit) 10, which is disposed on its rear side, a printing
unit 11, which is disposed on its front side, and an ink ribbon
portion 12, which is disposed on its upper side, are installed.
[0046] The paper sheet supply unit 10, which is a configuration
unit that supplies a continuous paper (print medium) P to the
printing unit 11, includes a support shaft 10a and a roll guiding
portion 10b, which is installed at one end of the support shaft
10a.
[0047] The support shaft 10a is a configuration portion that
rotatably supports the continuous paper P rolled up in a rolled
shape. The roll guiding portion 10b, which is a configuration
portion that fixes the rolled continuous paper P, is movably
installed along an axial direction of the support shaft 10a to be
able to change its position corresponding to a width of the
continuous paper P.
[0048] The continuous paper P includes, for example, a long liner
sheet and a plurality of labels adhered temporarily at every
predetermined interval along a longitudinal direction of the liner
sheet. On a surface where an adhesive surface of the label contacts
on the liner sheet, a releasing agent such as silicone or similar
material is coated, and this ensures the label to be peeled off
easily. On a surface where the label is not applied on the liner
sheet, position detection marks, which indicate a position of the
label, are formed at every predetermined interval along the
longitudinal direction. For the label, there is a case where a
thermal paper is used and a case where a plain paper is used. In
the case of the thermal paper, on its surface, a thermal coloring
layer, which develops a specific color (such as black or red) when
reaching a predetermined temperature region, is formed.
[0049] There are two types of continuous papers P: an outside wound
label and an inside wound label. The outside wound label is wound
in a state where the label of the continuous paper P is positioned
on an outer peripheral surface of the rolled continuous paper P,
and as shown in FIG. 3, a continuous paper Ps (P: dashed line) is
unwound from around the center in the height direction of the paper
sheet supply unit 10 toward a bottom portion of the printing unit
11. In contrast, the inside wound label is wound in a state where
the label of the continuous paper P is positioned on an inner
peripheral surface of the rolled continuous paper P, and as shown
in FIG. 3, a continuous paper Pb (P: solid line) is unwound from
around an internal bottom surface of the printer 1 toward the
bottom portion of the printing unit 11. It should be noted that for
both outside wound and inside wound, paper passing routes of the
continuous paper P (Ps, Pb) in the printing unit 11 are identical.
For both the outside wound label and the inside wound label, the
continuous paper P is fed in a state where a surface where the
label is temporarily adhered (printed surface) is upward.
[0050] The above-described printing unit 11, which is a
configuration unit that performs printing on the label of
continuous paper P or a similar print medium, includes a printing
head portion 13, a supporting stand 14, which is disposed below the
printing head portion 13, and a damper portion 15, which is
disposed on a rear (upstream of feed of the continuous paper P at
the printing direction) of them.
[0051] The printing head portion 13 is, as described below,
openably/closably installed inside the printer 1. When the printing
head portion 13 is in a closed state, between the printing head
portion 13 and the supporting stand 14, the paper passing route
(medium feed path) is formed. Then, this paper passing route is
coupled to the above-described issue port 5 (see FIG. 1).
[0052] On the supporting stand 14, a head lock lever portion 16,
which maintains the closed state of the printing head portion 13,
is installed. Operating this head lock lever portion 16 releases
the closed state of the printing head portion 13 and then a front
portion of the printing head portion 13 is lifted to open the
printing head portion 13 (the printing head portion 13 separates
from a platen roller portion 23).
[0053] The damper portion 15 is a configuration portion that gives
tension to the continuous paper P. According to the embodiment of
the present invention, the damper portion 15, which includes an
outer damper portion 15a and an inner damper portion 15b, moves in
the vertical direction (opens and closes) in conjunction with an
opening and closing of the printing head portion 13. However, in
the closed state of the printing head portion 13, the outer damper
portion 15a and the inner damper portion 15b are swingably
installed such that each can give tension to the continuous paper
P.
[0054] The above-described ink ribbon portion 12, which is a
configuration portion that supplies and rolls up an ink ribbon
where printing ink is applied, includes a ribbon supply unit 12a
and a ribbon roll up unit 12b, which is disposed on a lateral of a
front of the ribbon supply unit 12a. The ribbon supply unit 12a is
a configuration unit that rotatably supports the ink ribbon rolled
up in a rolled-shape. The ribbon roll up unit 12b is a
configuration unit that rolls up and recovers the already printed
ink ribbon RB. It should be noted that when using the ink ribbon,
the ink ribbon extracted from the ribbon supply unit 12a is passed
through below the printing head portion 13, and then rolled up by
the ribbon roll up unit 12b.
[0055] According to such printer 1, the continuous paper P (Ps,
Pb), which is unwound from the paper sheet supply unit 10 in a
sheet-shape, is fed to the paper passing route between the printing
head portion 13 and the supporting stand 14 via the damper portion
15, and in the middle of this, after a printing process is executed
on the label of the continuous paper P or a similar print medium,
is discharged outside the printer 1 from the issue port 5.
[0056] Next, a configuration of the above-described printing unit
11 will be described in reference to FIG. 4A to FIG. 7. FIG. 4A is
an enlarged perspective view where the printing unit in the closed
state of the printing head portion in FIG. 3 is viewed from a
front. FIG. 4B is an enlarged perspective view where the printing
unit in an open state of the printing head portion in FIG. 3 is
viewed from the front. FIG. 5 is an enlarged perspective view where
the printing unit in FIG. 4A is viewed from a back side. FIG. 6 is
an enlarged side view of the printing unit in FIG. 3. FIG. 7 is a
perspective view where a printing head portion in FIG. 6 is
extracted and viewed from a lower side.
[0057] The printing head portion 13 includes the front portion,
which is swingably in the vertical direction (that is, openably and
closably) supported by a head support plate 17 on one side surface
of the printing head portion 13 around a rotary shaft S1 (see FIG.
5 and FIG. 7) of a rear of the printing head portion 13.
[0058] On an inferior surface (surface facing the paper passing
route) of the printing head portion 13, a thermal head portion 18
(see FIG. 4B and FIG. 7) is installed in a state where its printing
surface faces the paper passing route. The thermal head portion 18
is printing means, which performs printing on the label of the
continuous paper P and similar print medium with heating resistors
of a printing line 18L disposed on a printing surface of the
thermal head portion 18. On this printing line 18L, a plurality of
heating resistors (heating elements), which generates heat by
energization, are arranged along a width direction (direction
perpendicular to the feed direction of the continuous paper P) of
the continuous paper P.
[0059] On an inferior surface of a front side of the printing head
portion 13, depressed claw portions 19, 19 (see FIG. 4B and FIG. 7)
are disposed so as to sandwich the thermal head portion 18. On an
inferior surface of the printing head portion 13, pins 20, 20,
which project outward from both side surfaces of the printing head
portion 13, are disposed on a rear of the depressed claw portion
19.
[0060] While such printing head portion 13 is biased in the opening
direction by a torsion spring 21 mounted on the rotary shaft S1
(see FIG. 5 and FIG. 7), the printing head portion 13 is maintained
to be in a closed state with lock claw portions 22, 22 of the
supporting stand 14 being hooked in the pins 20, 20 on a lower
portion of the printing head portion 13. Pulling the
above-described head lock lever portion 16 rightward in FIG. 6
moves the lock claw portion 22 rightward in FIG. 6 along with this,
thus unhooking the lock claw portion 22 from the pin 20. Unhooking
the lock claw portion 22 from the pin 20, as shown in FIG. 4B,
automatically opens the printing head portion 13 by biasing force
of the torsion spring 21.
[0061] In the closed state of the printing head portion 13, while
the depressed claw portions 19, 19 of the printing head portion 13
(see FIG. 4B and FIG. 7) are fitted on both end portions of a
rotary shaft S2 (see FIG. 4 and FIG. 6) of the platen roller
portion 23, a printing surface of the thermal head portion 18 are
pressed on the platen roller portion 23 (see FIG. 4A and FIG. 4B),
which is below the thermal head portion 18, by a pressing device
(pressing means) 24 (see FIG. 5) disposed on the printing head
portion 13.
[0062] The platen roller portion 23 is feeding means that feeds the
continuous paper P unwound from the paper sheet supply unit 10 to
the issue port 5 (see FIG. 1) along the paper passing route, and a
surface of the platen roller portion 23 is coated with elastic
material such as hard rubber. This platen roller portion 23 is
rotatably in normal and reverse directions installed on an upper
portion of the supporting stand 14. To one end in an axial
direction of the rotary shaft S2 of the platen roller portion 23, a
gear G1 is coupled. This gear G1, for example, is engaged with a
rotary shaft of a driver (not illustrated) such as a stepping motor
via such as a timing belt (not illustrated). The gear G1 is coupled
to a gear G4 via concatenation gears G2 and G3 (see FIG. 5). It
should be noted that the pressing device 24 will be described later
in detail.
[0063] According to the embodiment, on an end portion on the damper
portion 15 side on the head support plate 17, which supports the
printing head portion 13, a suppression portion 17a (see FIG. 5 to
FIG. 7) is integrally formed. This suppression portion 17a is
formed at an opposite position of a front portion of the head
support plate 17 with respect to the rotary shaft S1. On a surface
facing the damper portion 15 on a distal end of this suppression
portion 17a, a pin 17b (see FIG. 7), which projects from its
surface, is disposed. The suppression portion 17a and the pin 17b
are parts of a mechanism, which opens and closes the damper portion
15 in conjunction with an opening and closing of the printing head
portion 13.
[0064] This mechanism can make the damper portion 15 move in a
vertical direction (opens and closes) in conjunction with the
opening and closing of the printing head portion 13. That is, when
the printing head portion 13 opens, the damper portion 15 lifts up
in conjunction with the printing head portion 13, which widens a
width through which the continuous paper P is inserted, and a
visibility of a lower portion of the damper portion 15 can be
improved. Therefore, the continuous paper P extracted from the
paper sheet supply unit 10 can pass through below the damper
portion 15 not being caught by a width adjustment guiding portion.
Accordingly, an operation to insert the continuous paper P through
the paper passing route of the printer 1 can be facilitated.
[0065] Additionally, when the printing head portion 13 closes, the
damper portion 15 moves down to the original height in conjunction
with the printing head portion 13, thus this can prevent leaving
the damper portion 15 not closed. Accordingly, a malfunction to
print in a state where the continuous paper P is not given tension
is prevented. A sequence of inserting operation of the continuous
paper P can also be simplified.
[0066] Furthermore, a mechanism for opening the damper portion 15
manually is not disposed separately, and an opening mechanism and a
closing mechanism of the damper portion 15 are mutually doubled,
thus the structure can be simplified and the number of components
can be reduced. Accordingly, a cost of the printer 1 can be reduced
and downsizing of the printer 1 can be advanced.
[0067] It should be noted that in the paper passing route of the
printing unit 11, between the thermal head portion 18 and the
damper portion 15, a paper-sheet-position detecting sensor (not
illustrated) is disposed. This paper-sheet-position detecting
sensor, which is a sensor that detects a label position of the
continuous paper P by detecting the position detection mark
disposed on the continuous paper P or a liner sheet part between
adjacent labels, for example, is constituted of a light reflection
type or light transmission type sensor.
[0068] At the printing process, the continuous paper P is fed by
rotating the platen roller portion 23 in a state where the thermal
head portion 18 is pressed on a side of the platen roller portion
23 by the pressing device 24 while the continuous paper P is nipped
between the thermal head portion 18 and the platen roller portion
23. Then, based on information detected by the paper-sheet-position
detecting sensor, a printing timing is determined, and the heating
resistors of the printing line 18L are selectively heated by a
printing signal transmitted to the thermal head portion 18. Thus,
desired information, such as a character, a sign, a diagram, a
barcode, or similar information, is printed on the label of the
continuous paper P.
[0069] On the other hand, the outer damper portion 15a of the
damper portion 15, when viewing a side surface of the printing unit
11, extends obliquely downward from a front side to a rear side,
and is supported by a damper supporting member 25 around a rotary
shaft S3 of the front side (see FIG. 4A, FIG. 4B and FIG. 6) in a
state where the rear portion is swingable in the vertical
direction. It should be noted that a coil spring 26 in FIG. 5 is a
member that inhibits the outer damper portion 15a from going
excessively to an upper side (rear side), swingably supports the
outer damper portion 15a.
[0070] The inner damper portion 15b of the damper portion 15, when
viewing the side surface of the printing unit 11, extends obliquely
downward from the rear side to the front side in contrast to the
outer damper portion 15a, and is supported by the rear portion of
the outer damper portion 15a around a rotary shaft S4 (see FIG. 4A,
FIG. 4B and FIG. 6) on the rear side in a state where a front
portion is swingable in the vertical direction.
[0071] At the printing process, a paper sheet contact portion of
the inner damper portion 15b is positioned on a downstream of feed
of the continuous paper P with respect to a paper sheet contact
portion of the outer damper portion 15a. That is, the paper sheet
contact portion of the inner damper portion 15b is disposed between
the printing head portion 13 and the paper sheet contact portion of
the outer damper portion 15a.
[0072] At a phase before passing through the paper, a height of the
paper sheet contact portion of the inner damper portion 15b is
disposed at a lower position than a height of the paper sheet
contact portion of the outer damper portion 15a. That is, the
height of the paper sheet contact portion of the inner damper
portion 15b is disposed between the paper sheet contact portion of
the outer damper portion 15a and a bottom surface inside the
printer 1.
[0073] Disposing such inner damper portion 15b causes even the
inside wound label to be inserted to the paper passing route with
the continuous paper Pb contacting the inner damper portion 15b.
Accordingly, even with the inside wound label, the inner damper
portion 15b can give enough tension to the continuous paper Pb to
feed the continuous paper Pb properly and ensure the printing
quality.
[0074] Additionally, supporting the inner damper portion 15b in the
outer damper portion 15a pivotally can add the printer 1 a damper
function that is possible to give enough tension even to the inside
wound label without increasing a size of the printer 1.
[0075] On a lower portion of the outer damper portion 15a, a width
adjustment guiding portion 27 is movably installed along an axial
direction of the rotary shafts S3 and S4. The width adjustment
guiding portion 27 is a configuration portion that abuts on both
ends of the width direction of the continuous paper P fed from the
paper sheet supply unit 10, and guides the feed of the continuous
paper P. This width adjustment guiding portion 27 is coupled to a
guide operating portion 28 on a back side of the outer damper
portion 15a. This guide operating portion 28 is a tab for, while
moving the width adjustment guiding portion 27 according to the
width of the continuous paper P, fixing a position of the width
adjustment guiding portion 27.
[0076] According to the embodiment, on the bottom surface inside
the printer 1 below the damper portion 15, a depression portion 29
(see FIG. 6) is partially formed. The depression portion 29 is
formed in closed states of the printing head portion 13 and the
damper portion 15, so that a lower portion of the width adjustment
guiding portion 27 is positioned below the bottom surface inside
the printer 1. The width adjustment guiding portion 27 includes a
lower end portion but does not contact a bottom surface of the
depression portion 29, and is away from the bottom surface of the
depression portion 29 at only a predetermined distance. This lower
end portion of the width adjustment guiding portion 27 may be
formed, for example, in an arc-shape.
[0077] In a case where the depression portion 29 does not exist,
when executing a so-called back feeding, which returns the
continuous paper P from the printing unit 11 to a side of the paper
sheet supply unit 10, the continuous paper P slacks to contact a
bottom surface inside the printer 1. In this case, the continuous
paper P is positioned lower than the lower end portion of the width
adjustment guiding portion 27, and may fall outside the range
determined by the width adjustment guiding portion 27. However,
resuming the printing operation in this state causes the continuous
paper P to go over the width adjustment guiding portion 27 and be
fed in a state where the damper portion 15 does not function. As a
result, a printing position displaces from a planned position, and
thins a printing density to end up with a deteriorated printing
quality. In particular, a continuous paper P of a narrower width
easily deviates from the width adjustment guiding portion 27. The
rolled continuous paper P loaded in the paper sheet supply unit 10
may slack due to a fictitious force by rotation.
[0078] In contrast to this, in a case where the depression portion
29 is disposed, the lower portion of the width adjustment guiding
portion 27 of the damper portion 15 is positioned lower than a line
on the bottom surface inside the printer 1, and the continuous
paper P does not fall outside the range determined by the width
adjustment guiding portion 27. Accordingly, when resuming the
printing operation, the continuous paper P does not go over the
width adjustment guiding portion 27, thus the damper portion 15
functions without being impaired. Therefore, the malfunctions, such
as a printing position displacing from a planned position and
thinning of a printing density, can be avoided to improve the
printing quality of the printer 1.
[0079] The damper supporting member 25, which supports the
above-described outer damper portion 15a, is supported within the
printer 1 around of a rotary shaft S5 (see FIG. 5 and FIG. 6) on a
front portion side in a state where a rear portion is swingable in
a vertical direction.
[0080] On an upper portion of this damper supporting member 25, a
long groove portion (induction portion) 25a (see FIG. 5), which
extends along a longitudinal direction of the damper supporting
member 25, is formed. To this long groove portion 25a, the pin 17b
(see FIG. 8) of the above-described head support plate 17 is
movably fitted along the long groove portion 25a. Thus, the head
support plate 17, which supports the printing head portion 13, is
engaged with the damper supporting member 25.
[0081] The damper supporting member 25 includes the rear portion,
which while being biased in a direction opening above (direction
where the entire damper portion 15 rises) around the rotary shaft
S5 (see FIG. 5 and FIG. 6) by a torsion spring 30 (see FIG. 5)
mounted on the rotary shaft S5, is suppressed by the suppression
portion 17a while the suppression portion 17a of the head support
plate 17 is positioned on a side of the outer damper portion 15a,
and maintained in a closed state. On the other hand, when the
printing head portion 13 closes, the suppression portion 17a
returns to a suppression position from a suppression release
position along the long groove portion 25a of the damper supporting
member 25. Then the rear portion of the damper supporting member 25
decreases opposing the biasing force of the torsion spring 30 and
the damper portion 15 also is decreased automatically.
[0082] The opening and closing mechanism of the damper portion 15
is not limited to the above-described configuration. Also, for
example, the opening and closing mechanism of the damper portion 15
may be as follows. That is, the rear portion of the damper
supporting member 25 may be biased in a direction closing around
the rotary shaft S5 by the torsion spring 30 mounted on the rotary
shaft S5 (direction where the entire damper portion 15 is
decreased). In this case, when the printing head portion 13 opens,
as the suppression portion 17a moves from the suppression position
to the suppression release position along the long groove portion
25a, the rear portion of the damper supporting member 25 is pulled
to rise. Thus, the rear portion of the damper portion 15 opens in
conjunction with an opening operation of the printing head portion
13. On the other hand, when the printing head portion 13 closes, as
the suppression portion 17a moves from the suppression release
position to the suppression position along the long groove portion
25a, the rear portion of the damper supporting member 25 is
decreased by an action of the torsion spring 30, and the damper
portion 15 also is decreased. Thus, the rear portion of the damper
portion 15 closes in conjunction with a closing operation of the
printing head portion 13. In this case, the biasing force of the
torsion spring 21 on a side of the printing head portion 13 is
configured to be larger than the biasing force of the torsion
spring 30 on a side of the damper supporting member 25.
[0083] Next, a head mechanism disposed on the printing head portion
13 will be described in reference to FIG. 8 to FIG. 10. FIG. 8 is a
main part exploded perspective view of the head mechanism. FIG. 9
is a perspective view illustrating an assembled state of a head
slider portion and a head holding portion which constitute the head
mechanism in FIG. 8. FIG. 10 is a perspective view illustrating an
assembled state of the head mechanism in FIG. 8. It should be noted
that, in FIG. 10, an operating surface plate of the pressing device
is omitted to make a state inside the head mechanism easier to
see.
[0084] As illustrated in FIG. 8, a head mechanism 35 includes a
head slider portion 36, a head holding portion 37 and the pressing
device 24 in the order from the lower side.
[0085] The head slider portion 36 is a mechanism that moves a
position of the printing line 18L of the thermal head portion 18
back and forth (front and rear along the feed direction of the
continuous paper P) corresponding to the type of the print medium
(such as thickness and hardness). The head slider portion 36
includes a lower layer plate 36a, an upper layer plate 36b, a
rotary shaft 36c and a gear 36d.
[0086] The lower layer plate 36a is fixed to a back surface of the
thermal head portion 18 (a back side surface of the printing
surface) with screws 36e attachably/detachably. In a front side of
this lower layer plate 36a, parts at both ends in a longitudinal
direction of the lower layer plate 36a (the width direction of the
continuous paper P) are bent upward, and their upper tip portions
have depressed hook portions 36f, 36f formed.
[0087] Above the lower layer plate 36a, the upper layer plate 36b
is installed. The upper layer plate 36b supports the rotary shaft
36c rotatably. Both ends of the rotary shaft 36c in a longitudinal
direction fit in the above-described depressed hook portions 36f,
36f of the lower layer plate 36a. This engages the lower layer
plate 36a with the rotary shaft 36c.
[0088] One end of the rotary shaft 36c is coupled with the gear
36d. On the rotary shaft 36c, a portion where the depressed hook
portions 36f is engaged, and the rotary shaft portion between them
and the center of the gear 36d are decentered. In view of this, the
rotation of the gear 36d causes the lower layer plate 36a engaged
with the rotary shaft 36c to move back and forth. This can change
the position of the printing line 18L of the thermal head portion
18 to the appropriate position corresponding to the type of the
print medium (such as thickness and hardness), thus the printing
quality can be improved.
[0089] The upper layer plate 36b has a hole portion 36g (see FIG.
8) formed to penetrate its top and inferior surfaces. In this hole
portion 36g, a protrusion 18P disposed in the back surface of the
thermal head portion 18 is inserted.
[0090] The above-described head holding portion 37 is a mechanism
that holds the thermal head portion 18 attachably/detachably. The
head holding portion 37 includes a pressing plate 37a and a coil
spring 37b.
[0091] The pressing plate 37a is installed on the upper layer plate
36b with screws 37c, 37c in a state of being slightly movable along
its longitudinal direction (the width direction of the continuous
paper P). This pressing plate 37a has a hole portion 37d formed to
penetrate its top and inferior surfaces. Through this hole portion
37d, the above-described protrusion 18P is inserted. One end of the
pressing plate 37a in the longitudinal direction is bent downward,
and a head-hold releasing portion 37e (see FIG. 8) is formed on the
one end. A lower tip portion of this head-hold releasing portion
37e projects to the inferior surface of the printing head portion
13.
[0092] The coil spring 37b is mounted between the screws 37c, 37c.
The pressing plate 37a is biased to a direction pressing the
protrusion 18P by the coil spring 37b. This holds the thermal head
portion 18.
[0093] When removing the thermal head portion 18, release the
pressing by the pressing plate 37a on the protrusion 18P, by moving
the above-described head-hold releasing portion 37e of the pressing
plate 37a to the opposite direction with respect to the biasing
force of the coil spring 37b. On the other hand, when installing
the thermal head portion 18, press the thermal head portion 18 in a
state where the protrusion 18P is inserted in the hole portion 36g,
37d. Accordingly, the attachment and detachment of the thermal head
portion 18 can be facilitated.
[0094] Next, the pressing device 24 will be described in reference
to FIG. 8, FIG. 10 and FIG. 11 to FIG. 16. FIG. 11 is a perspective
view of the printing unit viewed from the front side. FIG. 12A is a
plan view of a top surface of an operating surface plate which
constitutes an operational panel unit of a pressing device. FIG.
12B is a plan view of a back surface of the operating surface plate
in FIG. 12A. FIG. 13A is a perspective view of the operating
surface plate in FIG. 12A viewed from a back side. FIG. 13B is a
main part enlarged perspective view of the back surface of the
operating surface plate in FIG. 13A. FIG. 14 is a cross-sectional
view of a XIV-XIV line of the printing head portion in FIG. 11.
FIG. 15 is a cross-sectional view of a XV-XV line of the printing
head portion in FIG. 11. FIG. 16 is a cross-sectional view of a
XVI-XVI line of the printing head portion in FIG. 11. It should be
noted that FIG. 14 to FIG. 16 are cross-sectional views, and only a
few parts in the drawings are hatched to make the drawings easier
to see.
[0095] As illustrated in FIG. 8, the pressing device 24 includes a
pressure operating panel unit (pressing-force adjustment portion)
40 and a head pressure plate (pressing member) 50.
[0096] The pressure operating panel unit 40 is a mechanism that
adjusts a pressing force against the printing line 18L of the
thermal head portion 18. The pressure operating panel unit 40 is
disposed on a top surface of the printing head portion 13, as
illustrated in FIG. 11. There are some cases where the pressure
operating panel unit 40 is disposed on a side surface of the
printing head portion 13. In such a case, a structure of the
pressing device becomes complicated, and a size of the printer
becomes large. In contrast to this, according to this embodiment,
the pressure operating panel unit 40 of the pressing device 24 is
disposed on the top surface of the printing head portion 13, which
achieves a simple structure of the pressing device 24, and the
downsizing of the printer 1. Additionally, a visibility of the
pressure operating panel unit 40 is improved, thus an operability
of the pressing device 24 can be improved.
[0097] The pressure operating panel unit 40 includes an operating
surface plate 41, a pressing force display unit 42, a pressing
force changing portion 43 (see FIG. 12B and FIG. 13) and an
operating portion 44.
[0098] The operating surface plate 41 is mounted on the top surface
of the printing head portion 13. On a top surface of this operating
surface plate 41, for example, a depressed area in an approximately
planar fan-shape is formed in two positions along the width
direction of the continuous paper P, and the pressing force display
unit 42 is formed in the depressed area.
[0099] On the pressing force display unit 42, for example, five
circles of which diameters gradually become larger or smaller along
an arc of the fan are provided. For example, here, the larger the
diameter of the circle is, the larger the pressing force is.
[0100] Each depressed area of the operating surface plate 41 has a
hole portion 41a (see FIG. 12) formed to penetrate top and inferior
surfaces of the operating surface plate 41. In a peripheral area of
the hole portion 41a on a back surface of the operating surface
plate 41, the pressing force changing portion 43 is formed. The
pressing force changing portion 43 is formed to be a stepwise shape
such that the projection heights change in stages along the
circumferential direction of the hole portion 41a (see FIG.
13).
[0101] In the position of the hole portion 41a in each depressed
area of the operating surface plate 41, the operating portion 44 is
installed in a rotatable state with respect to an inside surface of
the operating surface plate 41. The operating portion 44 has, as
illustrated in FIG. 8, a tab portion 44a, a large-diameter portion
44b, a small-diameter portion 44c, a coil spring (elastic member)
44d and a protrusion 44e.
[0102] The tab portion 44a is integrally molded on a top surface of
the large-diameter portion 44b. A part of this tab portion 44a
extends outside of an outer periphery of the top surface of the
large-diameter portion 44b. Rotating the operating portion 44 with
holding this extended end of the tab portion 44a can rotate the
operating portion 44 with relatively small force due to the
principle of leverage.
[0103] The small-diameter portion 44c is integrally molded under a
back surface of the large-diameter portion 44b. The small-diameter
portion 44c is formed to be cylindrical, and the coil spring 44d
(see FIG. 8, FIG. 14 and FIG. 15) is mounted within its cylinder.
The coil spring 44d is a member to press the head pressure plate 50
by abutting approximately on the middle of the head pressure plate
50 in the longitudinal direction.
[0104] The small-diameter portion 44c is inserted in the hole
portion 41a of the operating surface plate 41. On an outer
periphery of the small-diameter portion 44c, which projects from
this hole portion 41a, the protrusion 44e is formed to project in a
radial direction of the small-diameter portion 44c. This protrusion
44e contacts the stepped surface of the pressing force changing
portion 43. This causes the rotation of the operating portion 44 to
change the projection length of the small-diameter portion 44c in
stages that corresponds to the level difference of the steps of the
pressing force changing portion 43, and the pressing force of the
coil spring 44d against the head pressure plate 50 (that is, the
thermal head portion 18) change in stages.
[0105] The left side in FIG. 14 and the operating portion 44 in
FIG. 15 illustrate example states before the thermal head portion
18 is pressed. The coil spring 44d of the operating portion 44 is
not in contact with the head pressure plate 50. Meanwhile, the
right side in FIG. 14 and the operating portion 44 in FIG. 16
illustrate example states while the thermal head portion 18 is
pressed with the highest force. The coil spring 44d of the
operating portion 44 is in contact with the head pressure plate 50,
and pressing the head pressure plate 50.
[0106] The above-described head pressure plate 50 is a member to
transmit the pressing force from the operating portion 44 of the
pressure operating panel unit 40 to the printing line 18L of the
thermal head portion 18. The head pressure plate 50 is installed
between the operating surface plate 41 and the thermal head portion
18 in a state of being extended to connect a pressing portion of
the coil spring 44d of the operating portion 44 and the printing
line 18L of the thermal head portion 18.
[0107] Here, since two operating portions 44 are disposed, the head
pressure plate 50 is also disposed, for example, two, corresponding
to it. Thus, by disposing a plurality of head pressure plates 50,
the continuous paper P of various widths can be pressed properly,
and the proper printing onto the continuous paper P of various
widths can be achieved.
[0108] Each head pressure plate 50 has both ends in the width
direction bent upward, and bent portions 50a are formed on the end
portions. This ensures the head pressure plate 50 both mechanical
strength and weight reduction.
[0109] On this bent portion 50a, a hole portion 50b is formed in a
rear edge side on the head pressure plate 50 in the longitudinal
direction. In this hole portion 50b, a rotary shaft 51 is inserted.
With this, the head pressure plate 50 is pivotally supported by the
rotary shaft 51 in a state where its front side end portion
swingable in a vertical direction around the rotary shaft 51.
Accordingly, the height of the front side end portion of the head
pressure plate 50 can be adjusted corresponding to the print medium
thickness, thus the proper printing on the continuous paper P of
various thickness can be performed.
[0110] A front side end portion of the head pressure plate 50 in
the longitudinal direction is bent downward, and a protrusion 50c
is formed on the end portion. This protrusion 50c is configured to
press a back side of the printing line 18L of the thermal head
portion 18 locally. Between both the ends of the head pressure
plate 50 in the longitudinal direction, the above-described coil
spring 44d of the operating portion 44 contacts to press the head
pressure plate 50.
[0111] Next, actions of the pressing device 24 will be described in
reference to FIG. 17A and FIG. 17B. FIG. 17A is a schematic
cross-sectional view of the printing unit before a thermal head
portion is pressed. FIG. 17B is a schematic cross-sectional view of
the printing unit while the thermal head portion is being
pressed.
[0112] During the printing process, when the printing line 18L of
the thermal head portion 18 fails to be in contact closely enough
with the print medium, the heat of the heating resistors of the
printing line 18L is not transmitted onto the print medium
properly, thus the printing quality deteriorates. In view of this,
the printing is performed in a state where the printing line 18L is
closely contacted with the print medium by the thermal head portion
18 being pressed on a side of the platen roller portion 23 during
the printing process.
[0113] Besides thin and relatively soft materials such as the
continuous paper P with labels, the print medium has thick and
relatively hard materials such as tags. The pressing force against
the thermal head portion is adjusted corresponding to each material
to achieve the close contact between the printing line and the
print medium.
[0114] To press the printing line 18L effectively, it is preferable
to dispose the operating portion 44 immediately above the printing
line 18L. However, since another member is arranged immediately
above the printing line 18L, disposing the operating portion 44
immediately above the printing line 18L causes increased size of
the printer 1.
[0115] Therefore, according to the embodiment, as illustrated in
FIG. 17A, the operating portion 44 is disposed rearward with
respect to the printing line 18L, and the head pressure plate 50 is
disposed in between the pressing portion of the coil spring 44d of
the operating portion 44 and the printing line 18L to connect
them.
[0116] In this way, as illustrated in FIG. 17B, the pressing force
of the coil spring 44d of the operating portion 44 can be
transmitted to the printing line 18L of the thermal head portion 18
locally by the head pressure plate 50 and the protrusion 50c. As a
result, the pressing force by the operating portion 44 of the
pressure operating panel unit 40 can be transmitted to the printing
line 18L of the thermal head portion 18 effectively without causing
the size of the printer 1 to become larger. Accordingly, the
printing line 18L can be pressed effectively to improve the
printing quality.
[0117] As described above, the invention made by the present
inventor has been described specifically based on the embodiment.
However, it should be understood that the embodiment disclosed
herein is for illustrative purposes in all respects, and is not
limited to the technique disclosed. That is, the technical scope of
the present invention should not be construed in a restrictive
manner based on the description in the embodiment, should be
construed in accordance with the description in a range of the
claim as a principle, and the technique identical to the technique
disclosed in a range of the claim and all changes within the scope
of the claim are included.
[0118] According to the embodiment, a case that a continuous paper,
which includes a plurality of labels adhered temporarily on a liner
sheet, is used as a print medium has been described, but this
should not be construed in a limiting sense; for example, a
continuous label including an adhesive surface on one surface
(label without liner sheet), a continuous sheet without an adhesive
surface (continuous sheet), or, not limited to papers, a printable
film by a thermal head or a similar film can be used as a print
medium. The label without liner sheet, the continuous sheet, or the
film can include a position detection mark. In the case where the
label without liner sheet, where an adhesive is exposed, or a
similar label is fed, a roller including silicone may be disposed
while a non-adhesive coating is applied to a feed path.
[0119] In the above description, the present invention has been
described in a case applying to a stand-alone type printer, where
an input operation to the printer is executed without a personal
computer, but this should not be construed in a limiting sense; for
example, the present invention may also apply to an on-line type
printer, where the input operation to the printer is executed via
the personal computer.
[0120] This application claims the priority based on Patent
Application No. 2013-268264 filed in the Japan Patent Office on
Dec. 26, 2013, and every content of this application is
incorporated herein by reference.
* * * * *